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Date: Fri, 25 Feb 2011 12:05:18 +0000
From: Jonathan Cameron <jic23@....ac.uk>
To: Jon Brenner <jbrenner@...Sinc.com>
CC: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH: 2.6.37 1/1] TAOS 258x: Device Driver
Lots of cc's added. Note that a driver like this that touches a number
of subsystems needs to also go to their individual mailing lists as
not everyone monitors lkml very closely.
> From: J. August Brenner <jbrenner@...sinc.com>
>
> This driver supports the TAOS tsl258x family of ALS sensors.
> This driver provides ALS data (lux), and device configuration via ioctl,
> input_event, sysfs/iio methods. These methods are provided to support
> varied access requirements and integrated into a single driver.
> Thus, adverting the need for multiple releases of similar code.
> More significantly, this driver provides the capability to be fed 'glass
> coefficients' to accommodate varying system designs (bezels, faceplates,
> etc.).
>
> Signed-off-by: Jon August Brenner <jbrenner@...sinc.com>
>
> ---
> diff -Naurp drivers-orig/Kconfig drivers/Kconfig
> --- drivers-orig/Kconfig 2011-01-04 18:50:19.000000000 -0600
> +++ drivers/Kconfig 2011-02-24 16:03:53.536188000 -0600
> @@ -13,6 +13,13 @@ config SENSORS_TSL2563
> This driver can also be built as a module. If so, the module
> will be called tsl2563.
>
> +config TAOS_258x
> + tristate "TAOS TSL258x device driver"
> + default m
> + help
> + Provides support for the TAOS tsl258x family of devices.
> + Access ALS data via iio, sysfs, input_event, and ioctl methods.
> +
> config SENSORS_ISL29018
> tristate "ISL 29018 light and proximity sensor"
> depends on I2C
> diff -Naurp drivers-orig/Makefile drivers/Makefile
> --- drivers-orig/Makefile 2011-01-04 18:50:19.000000000 -0600
> +++ drivers/Makefile 2011-02-24 16:04:31.701642000 -0600
> @@ -3,4 +3,5 @@
> #
>
> obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
> +obj-$(CONFIG_TAOS_258x) += tsl258x.o
> obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
> diff -Naurp drivers-orig/tsl258x.c drivers/tsl258x.c
> --- drivers-orig/tsl258x.c 1969-12-31 18:00:00.000000000 -0600
> +++ drivers/tsl258x.c 2011-02-24 14:07:43.416960000 -0600
> @@ -0,0 +1,2055 @@
> +/*
> + * Device driver for monitoring ambient light intensity (lux)
> + * within the TAOS tsl258x family of devices
> + *
> + * Copyright (c) 2011, TAOS Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful, but
> WITHOUT
> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
> or
> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
> License for
> + * more details.
> + *
> + * You should have received a copy of the GNU General Public License
> along
> + * with this program; if not, write to the Free Software Foundation,
> Inc.,
> + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
> + */
> +
> +#include <linux/mutex.h>
> +#include <linux/pm_runtime.h>
> +#include <linux/wait.h>
> +#include <linux/kernel.h>
> +#include <linux/fs.h>
> +#include <linux/cdev.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/i2c.h>
> +#include <linux/hwmon.h>
> +#include <linux/timer.h>
> +#include <linux/uaccess.h>
> +#include <linux/errno.h>
> +#include <linux/delay.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio.h>
> +#include <linux/proc_fs.h>
> +#include <linux/ioport.h>
> +#include <linux/serial_core.h>
> +#include <linux/platform_device.h>
> +#include <linux/workqueue.h>
> +#include <linux/firmware.h>
> +#include <linux/string.h>
> +#include <linux/kmod.h>
> +#include <linux/ctype.h>
> +#include <linux/input.h>
> +#include <linux/time.h>
> +#include <linux/jiffies.h>
> +#include "../iio.h"
> +
> +/*........................................................................*/
> +#define DRIVER_VERSION_ID "3.9"
> +
> +#define TAOS258x 2
> +
> +/* This build will be for..*/
> +#define DRIVER_TYPE TAOS258x
> +
> +/*........................................................................*/
> +/*Debug related*/
> +#define TAOS_DEBUG 1
> +/*#define TAOS_DEBUG_SMBUS 1 */
> +#define TAOS_IRQ_DEBUG 1
> +/*........................................................................*/
> +/*User notification method*/
> +/*#define ASYNC_NOTIFY 1 */
> +#define EVENT_NOTIFY 1
> +/*........................................................................*/
> +/*Module defines*/
> +/* Device name/id/address */
> +#define DEVICE_NAME "taos"
> +#ifdef TAOS258x
> +#define DEVICE_ID "skateFN"
> +#else
> +#define DEVICE_ID "tritonFN"
> +#endif
> +
> +#define ID_NAME_SIZE 10
> +#define DEVICE_ADDR1 0x29
> +#define DEVICE_ADDR2 0x39
> +#define DEVICE_ADDR3 0x49
> +#define MAX_NUM_DEVICES 3
> +#define MAX_DEVICE_REGS 32
> +#define I2C_MAX_ADAPTERS 8
> +
> +/* Triton register offsets */
> +#ifdef TAOS258x
> +#define TAOS_REG_MAX 8
> +#else
> +#define TAOS_REG_MAX 16
> +#endif
> +
> +/* Power management */
> +#define taos_suspend NULL
> +#define taos_shutdown NULL
> +#define taos_resume NULL
> +
> +#define TRUE 1
> +#define FALSE 0
> +
> +#define MAXI2C 32
> +#define CMD_ADDRESS 0x80
> +#define TAOS_ERROR -1
> +#define TAOS_SUCCESS 0
> +
> +#define MAX_SAMPLES_CAL 200
> +
> +#define LUX_UPDATE_PERIOD (HZ/2)
> +
> +/* power control */
> +#define ON 1
> +#define OFF 0
> +
> +
> +/* sensor type */
> +#define LIGHT 1
> +#define PROXIMITY 2
> +#define ALL 3
> +
> +struct taos_als_info {
> + u16 als_ch0;
> + u16 als_ch1;
> + u16 lux;
> +};
> +
> +struct taos_settings {
> + int als_time;
> + int als_gain;
> + int als_gain_trim;
> + int als_cal_target;
> + int interrupts_enabled;
> + int als_thresh_low;
> + int als_thresh_high;
> + char als_persistence;
> +};
> +
> +/* ioctl numbers */
> +#define TAOS_IOCTL_MAGIC 0XCF
> +#define TAOS_IOCTL_ALS_ON _IO(TAOS_IOCTL_MAGIC, 1)
> +#define TAOS_IOCTL_ALS_OFF _IO(TAOS_IOCTL_MAGIC, 2)
> +#define TAOS_IOCTL_ALS_DATA _IOR(TAOS_IOCTL_MAGIC, 3, short)
> +#define TAOS_IOCTL_ALS_CALIBRATE _IO(TAOS_IOCTL_MAGIC, 4)
> +#define TAOS_IOCTL_CONFIG_GET _IOR(TAOS_IOCTL_MAGIC, 5,\
> + struct taos_settings)
> +#define TAOS_IOCTL_CONFIG_SET _IOW(TAOS_IOCTL_MAGIC, 6, \
> + struct taos_settings)
> +#define TAOS_IOCTL_LUX_TABLE_GET _IOR(TAOS_IOCTL_MAGIC, 7, \
> + struct taos_lux)
> +#define TAOS_IOCTL_LUX_TABLE_SET _IOW(TAOS_IOCTL_MAGIC, 8, \
> + struct taos_lux)
> +#define TAOS_IOCTL_ID _IOR(TAOS_IOCTL_MAGIC, 12, char*)
> +#define TAOS_IOCTL_SET_GAIN _IOW(TAOS_IOCTL_MAGIC, 15, int)
> +#define TAOS_IOCTL_GET_ALS _IOR(TAOS_IOCTL_MAGIC, 16, \
> + struct taos_als_info)
> +#define TAOS_IOCTL_INT_SET _IOW(TAOS_IOCTL_MAGIC, 17, int)
> +
> +/*Device Registers and Masks*/
> +#define CNTRL 0x00
> +#define STATUS 0x00
> +#define ALS_TIME 0X01
> +#define INTERRUPT 0x02
> +#define ALS_MINTHRESHLO 0X03
> +#define ALS_MINTHRESHHI 0X04
> +#define ALS_MAXTHRESHLO 0X05
> +#define ALS_MAXTHRESHHI 0X06
> +#define GAIN 0x07
> +#define REVID 0x11
> +#define CHIPID 0x12
> +#define SMB_4 0x13
> +#define ALS_CHAN0LO 0x14
> +#define ALS_CHAN0HI 0x15
> +#define ALS_CHAN1LO 0x16
> +#define ALS_CHAN1HI 0x17
> +#define TMR_LO 0x18
> +#define TMR_HI 0x19
> +
> +/* Skate cmd reg masks */
> +#define CMD_REG 0x80
> +#define CMD_BYTE_RW 0x00
> +#define CMD_WORD_BLK_RW 0x20
> +#define CMD_SPL_FN 0x60
> +#define CMD_ALS_INTCLR 0X01
> +
> +/* Skate cntrl reg masks */
> +#define CNTL_REG_CLEAR 0x00
> +#define CNTL_ALS_INT_ENBL 0x10
> +#define CNTL_WAIT_TMR_ENBL 0x08
> +#define CNTL_ADC_ENBL 0x02
> +#define CNTL_PWRON 0x01
> +#define CNTL_ALSPON_ENBL 0x03
> +#define CNTL_INTALSPON_ENBL 0x13
> +
> +/* Skate status reg masks */
> +#define STA_ADCVALID 0x01
> +#define STA_ALSINTR 0x10
> +#define STA_ADCINTR 0x10
> +
> +/* Lux constants */
> +#define MAX_LUX 65535
> +
> +/* Thresholds */
> +#define ALS_THRESHOLD_LO_LIMIT 0x0010
> +#define ALS_THRESHOLD_HI_LIMIT 0xFFFF
> +
> +/* Device default configuration */
> +#define ALS_TIME_PARAM 100
> +#define SCALE_FACTOR_PARAM 1
> +#define GAIN_TRIM_PARAM 512
> +#define GAIN_PARAM 1
> +#define ALS_THRSH_HI_PARAM 0xFFFF
> +#define ALS_THRSH_LO_PARAM 0
> +
> +
> +/* Prototypes */
> +static void taos_defaults(void);
> +static int taos_chip_on(void);
> +static int taos_chip_off(void);
> +static int taos_get_lux(void);
> +
> +struct i2c_adapter *i2c_get_adapter(int id);
> +
> +static int taos_probe(struct i2c_client *clientp,
> + const struct i2c_device_id *idp);
> +static int taos_remove(struct i2c_client *client);
> +static int taos_open(struct inode *inode, struct file *file);
> +static int taos_release(struct inode *inode, struct file *file);
> +static int taos_ioctl(struct inode *inode, struct file *file, unsigned
> int cmd,
> + unsigned long arg);
> +static int taos_read(struct file *file, char *buf, size_t count, loff_t
> *ppos);
> +static int taos_write(struct file *file, const char *buf, size_t count,
> + loff_t *ppos);
> +static loff_t taos_llseek(struct file *file, loff_t offset, int orig);
> +static int taos_fasync(int fd, struct file *file, int mode);
> +static int taos_device_name(unsigned char *bufp, char **device_name);
> +static int taos_als_calibrate(unsigned long als_cal_target);
> +static void taos_als_auto_update(struct work_struct *update);
> +
> +/*........................................................................*/
> +/* Various /misc. emun*/
> +enum {
> + TAOS_CHIP_UNKNOWN = 0, TAOS_CHIP_WORKING = 1, TAOS_CHIP_SLEEP = 2
> +} TAOS_CHIP_WORKING_STATUS;
> +
> +/*........................................................................*/
> +
> +char driver_version_id[] = DRIVER_VERSION_ID;
> +
> +/*........................................................................*/
> +
> +/* First device number */
> +static dev_t taos_dev_number;
> +
> +/* Class structure for this device */
> +static struct class *taos_class;
> +
> +/* Module device table */
> +static struct i2c_device_id taos_idtable[] = {
> + { DEVICE_ID, 0 },
> + { } };
> +MODULE_DEVICE_TABLE(i2c, taos_idtable);
> +
> +/* Board and address info */
> +static struct i2c_board_info taos_board_info[] = {
> + { I2C_BOARD_INFO(DEVICE_ID, DEVICE_ADDR1), },
> + { I2C_BOARD_INFO(DEVICE_ID, DEVICE_ADDR2), },
> + { I2C_BOARD_INFO(DEVICE_ID, DEVICE_ADDR3), }, };
> +
> +static unsigned short const taos_addr_list[4] = {
> + DEVICE_ADDR1,
> + DEVICE_ADDR2,
> + DEVICE_ADDR3,
> + I2C_CLIENT_END };
> +
> +/* Client and device */
> +static struct i2c_client *client;
> +static struct device *devp;
> +static struct i2c_client *bad_clientp[MAX_NUM_DEVICES];
> +static int device_found;
> +
> +/* Driver definition */
> +static struct i2c_driver taos_driver = {
> + .driver = {
> + .owner = THIS_MODULE,
> + .name = DEVICE_NAME, },
> + .id_table = taos_idtable,
> + .probe = taos_probe,
> + .remove = __devexit_p(taos_remove),
> + .suspend = taos_suspend,
> + .shutdown = taos_shutdown,
> + .resume = taos_resume, };
> +
> +/* Per-device data */
> +static struct tsl258x_chip {
> + struct i2c_client *client;
> + struct iio_dev *iio_dev;
> + struct delayed_work update_lux;
> + struct work_struct work_thresh;
> + s64 event_timestamp;
> + struct cdev cdev;
> + struct fasync_struct *async_queue;
> + unsigned int addr;
> + char taos_id;
> + char taos_name[ID_NAME_SIZE];
> + char valid;
> + unsigned long last_updated;
> +
> +} *chip;
> +
> +/* File operations */
> +static const struct file_operations taos_fops = {
> + .owner = THIS_MODULE,
> + .open = taos_open,
> + .release = taos_release,
> + .read = taos_read,
> + .write = taos_write,
> + .llseek = taos_llseek,
> + .fasync = taos_fasync,
> + .ioctl = taos_ioctl, };
> +
> +/* ................ Als info ..................*/
> +struct taos_als_info als_cur_info;
> +EXPORT_SYMBOL(als_cur_info);
> +
> +/*Next two vars are also used to determine irq type - in lieu status
> info*/
> +bool als_on = FALSE;
> +
> +static int device_released = 0x0000;
> +static unsigned int irqnum = 0x0000;
> +static DECLARE_WAIT_QUEUE_HEAD(taos_int_wait);
> +
> +/* Lux time scale */
> +struct time_scale_factor {
> + unsigned int numerator;
> + unsigned int denominator;
> + unsigned int saturation;
> +};
> +
> +/* ------ Mutex ------*/
> +DEFINE_MUTEX(als_mutex);
> +
> +/*Structs & vars*/
> +int taos_chip_status = TAOS_CHIP_UNKNOWN; /*Unknown = uninitialized to
> start*/
> +int taos_cycle_type; /* what is the type of cycle being run: ALS, PROX,
> or BOTH
> + */
> +struct taos_settings taos_settings;
> +EXPORT_SYMBOL(taos_settings);
> +
> +/* Device configuration */
> +#define MAX_SETTING_MEMBERS 6
> +static struct taos_settings *taos_settingsP; /*Pointer Needed for
> ioctl(s)*/
> +
> +/*More Prototypes*/
> +static int taos_i2c_read(u8 reg, u8 *val, unsigned int len);
> +static int taos_i2c_write(u8 reg, u8 *val);
> +static int taos_i2c_write_command(u8 reg);
> +
> +/* Work Queues used for bottom halves of self poll/push & IRQs */
> +static struct workqueue_struct *taos_wq0;
> +
> +struct delayed_work *luxUd;
> +/*........................................................................*/
> +/*
> + Initial values for device - this values can/will be changed by driver.
> + and applications as needed.
> + These values are dynamic.
> + */
> +u8 taos_config[8] = { 0x00, 0xee, 0x00, 0x03, 0x00, 0xFF, 0xFF, 0x00 };
> +/* cntrl atime intC Athl0 Athl1 Athh0 Athh1 gain*/
> +
> +/*
> + This structure is intentionally large to accommodate updates via
> + ioctl and proc input methods.
> + */
> +struct taos_lux {
> + unsigned int ratio;
> + unsigned int ch0;
> + unsigned int ch1;
> +} taos_device_lux[] = {
> + { 9830, 8520, 15729 },
> + { 12452, 10807, 23344 },
> + {14746, 6383, 11705 },
> + { 17695, 4063, 6554 },
> + { 0, 0, 0 },
> + { 0, 0, 0 },
> + { 0, 0, 0 },
> + { 0, 0, 0 },
> + { 0, 0, 0 },
> + { 0, 0, 0 },
> + { 0, 0, 0 } };
> +
> +struct taos_lux taos_lux;
> +EXPORT_SYMBOL(taos_lux);
> +
> +int als_time_scale; /*computed, ratios lux due to als integration
> time*/
> +int als_saturation; /*computed, set to 90% of full scale of als
> integration*/
> +
> +/*Index = (0 - 3) Used to validate the gain selection index*/
> +#define MAX_GAIN_STAGES 4
> +struct gainadj {
> + s16 ch0;
> + s16 ch1;
> +} gainadj[] = {
> + { 1, 1 },
> + { 8, 8 },
> + { 16, 16 },
> + { 107, 115 } };
> +
> +struct taos_lux *taos_device_luxP;
> +
> +/*Input_dev*/
> +static struct input_dev *taos_dev;
> +
> +/*sysfs - interface functions*/
> +static ssize_t taos_device_id(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static DEVICE_ATTR(device_id, S_IRUGO, taos_device_id, NULL);
> +
> +static ssize_t taos_power_state_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_power_state_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(device_state, S_IRUGO | S_IWUSR,
> + taos_power_state_show,
> + taos_power_state_store);
> +
> +static ssize_t taos_gain_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_gain_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_gain, S_IRUGO | S_IWUSR,
> + taos_gain_show,
> + taos_gain_store);
> +
> +static ssize_t taos_interrupt_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_interrupt_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_interrupt, S_IRUGO | S_IWUSR,
> + taos_interrupt_show,
> + taos_interrupt_store);
> +
> +static ssize_t taos_als_time_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_time_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_time, S_IRUGO | S_IWUSR,
> + taos_als_time_show,
> + taos_als_time_store);
> +
> +static ssize_t taos_als_trim_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_trim_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_trim, S_IRUGO | S_IWUSR,
> + taos_als_trim_show,
> + taos_als_trim_store);
> +
> +static ssize_t taos_als_persistence_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_persistence_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_persistence, S_IRUGO | S_IWUSR,
> + taos_als_persistence_show,
> + taos_als_persistence_store);
> +
> +static ssize_t taos_als_cal_target_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_cal_target_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_target, S_IRUGO | S_IWUSR,
> + taos_als_cal_target_show,
> + taos_als_cal_target_store);
> +
> +static ssize_t taos_lux_show(struct device *dev, struct
> device_attribute *attr,
> + char *buf);
> +static DEVICE_ATTR(lux, S_IRUGO, taos_lux_show, NULL);
> +
> +static ssize_t taos_do_calibrate(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(calibrate, S_IWUSR, NULL, taos_do_calibrate);
> +
> +static ssize_t taos_als_thresh_low_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_thresh_low_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_lowT, S_IRUGO | S_IWUSR,
> + taos_als_thresh_low_show,
> + taos_als_thresh_low_store);
> +
> +static ssize_t taos_als_thresh_high_show(struct device *dev,
> + struct device_attribute *attr, char *buf);
> +static ssize_t taos_als_thresh_high_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len);
> +static DEVICE_ATTR(als_highT, S_IRUGO | S_IWUSR,
> + taos_als_thresh_high_show,
> + taos_als_thresh_high_store);
> +
> +
> +static struct attribute *sysfs_attrs_ctrl[] = {
> + &dev_attr_device_id.attr,
> + &dev_attr_device_state.attr,
> + &dev_attr_als_gain.attr,
> + &dev_attr_als_interrupt.attr,
> + &dev_attr_als_time.attr,
> + &dev_attr_als_trim.attr,
> + &dev_attr_als_persistence.attr,
> + &dev_attr_als_target.attr,
> + &dev_attr_lux.attr,
> + &dev_attr_calibrate.attr,
> + &dev_attr_als_lowT.attr,
> + &dev_attr_als_highT.attr,
> + NULL };
> +
> +static struct attribute_group tsl258x_attribute_group[] = {
> + { .attrs = sysfs_attrs_ctrl }, };
> +
> +
> +/*===========================================================================*/
> +/*
> +
> + FUNCTIONS BEGIN HERE
> +
> + */
> +/*===========================================================================*/
> +
> +/*===========================================================================*/
> +/**@...group Initialization Driver Initialization
> + * The sections applies to functions for driver initialization,
> instantiation,
> + * _exit, \n
> + * and user-land application invoking (ie. open).\n
> + * Also included in this section is the initial interrupt handler
> (handler
> + * bottom halves are in the respective
> + * sections).
> + * @{
> + */
> +
> +/*........................................................................*/
> +/** Driver initialization - device probe is initiated here, to identify
> + * a valid device if present on any of the i2c buses and at any
> address.
> + * \param none
> + * \return: int (0 = OK)
> + * \note H/W Interrupt are device/product dependent.
> + * Attention is required to the definition and configuration.
> + */
> +/*........................................................................*/
> +static int __init taos_init(void)
> +{
> + u32 err;
> + int i, j, k, ret = 0;
> + struct i2c_adapter *my_adap;
> + static int num_bad = 0x0000;
> +
> +#ifdef TAOS_DEBUG
> + printk(KERN_ERR "Loading TAOS Driver\n");
> + printk(KERN_INFO "\nRequesting a GPIO for irq\n");
> +#endif
> +/*......................................................................*/
> + /*Create the work queue and allocate kernel memory for the
> + * scheduled workers*/
> + taos_wq0 = create_workqueue("taos_work_queue");
> + if (taos_wq0)
> + luxUd = kmalloc(sizeof(struct delayed_work), GFP_KERNEL);
> +
> + /*Make sure we have what we need */
> + if ((!taos_wq0) || (!luxUd))
> + return -ENOMEM;
> +
> +/*.....................................................................*/
> + ret = alloc_chrdev_region(&taos_dev_number, 0, MAX_NUM_DEVICES,
> + DEVICE_NAME);
> + if (ret < 0) {
> + dev_err(devp, "taos_device_drvr: alloc_chrdev_region()"
> + "failed in taos_init()\n");
> + return ret;
> + }
> + taos_class = class_create(THIS_MODULE, DEVICE_NAME);
> + chip = kmalloc(sizeof(struct tsl258x_chip), GFP_KERNEL);
> + if (!chip) {
> + dev_err(devp, "taos_device_drvr: kmalloc for "
> + "struct tsl258x_chip failed in taos_init()\n");
> + ret = -ENOMEM;
> + goto exit_3;
> + }
> + memset(chip, 0, sizeof(struct tsl258x_chip));
> + cdev_init(&chip->cdev, &taos_fops);
> + chip->cdev.owner = THIS_MODULE;
> +
> + ret = cdev_add(&chip->cdev, taos_dev_number, 1);
> + if (ret < 0) {
> + dev_err(devp, "taos_device_drvr: cdev_add() failed in "
> + "taos_init()\n");
> + goto exit_2;
> + }
> + device_create(taos_class, NULL, MKDEV(MAJOR(taos_dev_number), 0),
> + &taos_driver , DEVICE_NAME);
> + ret = i2c_add_driver(&taos_driver);
> + if (ret < 0) {
> + dev_err(devp, "taos_device_drvr: i2c_add_driver() failed in "
> + "taos_init()\n");
> + goto exit_1;
> + }
> + device_found = 0;
> + for (i = 0; i < I2C_MAX_ADAPTERS; i++) {
> + my_adap = i2c_get_adapter(i);
> + if (my_adap == NULL)
> + break;
> + for (j = 0; j < MAX_NUM_DEVICES; j++) {
> + client = i2c_new_probed_device(my_adap,
> + &taos_board_info[j], taos_addr_list);
> + if ((client) && (!device_found)) {
> + bad_clientp[num_bad] = client;
> + num_bad++;
> + }
> + if (device_found)
> + break;
> + }
> + if (num_bad) {
> + for (k = 0; k < num_bad; k++)
> + i2c_unregister_device(bad_clientp[k]);
> + num_bad = 0;
> + }
> + if (device_found)
> + break;
> + }
> + if (device_found) {
> + devp = &client->dev;
> + goto exit_4;
> + } else {
> + if (client)
> + i2c_unregister_device(client);
> + i2c_del_driver(&taos_driver);
> + device_destroy(taos_class, MKDEV(MAJOR(taos_dev_number), 0));
> + cdev_del(&chip->cdev);
> + kfree(chip);
> + class_destroy(taos_class);
> + unregister_chrdev_region(taos_dev_number, MAX_NUM_DEVICES);
> + printk(KERN_ERR "taos_device_drvr: taos_init() found no device\n");
> + return -ENODEV;
> + }
> +
> +exit_1: device_destroy(taos_class, MKDEV(MAJOR(taos_dev_number), 0));
> +exit_2: cdev_del(&chip->cdev);
> + kfree(chip);
> +exit_3: class_destroy(taos_class);
> + unregister_chrdev_region(taos_dev_number, MAX_NUM_DEVICES);
> +
> +exit_4:
> +
> + printk(KERN_INFO "\n\nallocating iio device\n");
> + chip->iio_dev = iio_allocate_device();
> + if (!chip->iio_dev)
> + printk(KERN_INFO "iio allocation failed\n");
> +
> + chip->iio_dev->attrs =
> + (struct attribute_group *)&tsl258x_attribute_group;
> + chip->iio_dev->dev.parent = &client->dev;
> + chip->iio_dev->dev_data = (void *)(chip);
> + chip->iio_dev->driver_module = THIS_MODULE;
> + chip->iio_dev->modes = INDIO_DIRECT_MODE;
> + err = iio_device_register(chip->iio_dev);
> +
> + if (err)
> + printk(KERN_INFO "iio registration failed\n");
> +
> + /*Make sure the chip is off*/
> + taos_chip_off();
> + /*Load up the V2 defaults (these are hard coded defaults for now)*/
> + taos_defaults();
> + /*Set any other defaults that are needed to initialize
> + * (such as taos_cycle_type).
> + Note: these settings can/will be changed based on user
> requirements.*/
> + taos_cycle_type = LIGHT;
> + /*Initialize the work queues*/
> +
> + INIT_DELAYED_WORK(luxUd, taos_als_auto_update);
> +
> + /*...................................................................*/
> + /*This section populates the input structure and registers the
> device*/
> +#ifdef EVENT_NOTIFY
> + taos_dev = input_allocate_device();
> + if (!taos_dev) {
> + printk(KERN_ERR "__init: Not enough memory for input_dev\n");
> + return ret;
> + }
> +
> + /*Since we now have the struct, populate.*/
> + taos_dev->name = DEVICE_ID;
> + taos_dev->id.bustype = BUS_I2C;
> + taos_dev->id.vendor = 0x0089;
> + taos_dev->id.product = 0x2581;
> + taos_dev->id.version = 3;
> + taos_dev->phys = "/dev/taos";
> +
> + /*This device one value (LUX)
> + Other devices may have LUX and PROX.
> + Thus we use the ABS_X so ABS_Y is logically available.*/
> + set_bit(EV_ABS, taos_dev->evbit);
> + set_bit(ABS_X, taos_dev->absbit);
> +
> + /*Only returns only positive LUX values
> + No noise filter, no flat level*/
> + taos_dev->absmin[ABS_X] = 0;
> + taos_dev->absmax[ABS_X] = MAX_LUX;
> + taos_dev->absfuzz[ABS_X] = 0;
> + taos_dev->absflat[ABS_X] = 0;
> +
> + /*And register..*/
> + ret = input_register_device(taos_dev);
> + if (ret) {
> + printk(KERN_ERR "button.c: Failed to register input_dev\n");
> + goto err_free_dev;
> + }
> +#endif /*End of input_event*/
> +
> +
> + /*invoke sysfs
> + invoke iio subsystem*/
> +
> + err = sysfs_create_group(&chip->client->dev.kobj,
> + tsl258x_attribute_group);
> + if (err < 0) {
> + dev_err(&chip->client->dev, "Sysfs registration failed\n");
> + goto err_free_dev;
> + }
> +
> + if (taos_wq0)
> + ret = queue_delayed_work(taos_wq0, luxUd, LUX_UPDATE_PERIOD);
> + else
> + printk(KERN_INFO "\nNO taos_wq0 for luxUd\n\n");
> +
> + return ret; /*Normal return*/
> +
> +/*In the event we had a problem REGISTERING the device for
> input_events*/
> +err_free_dev:
> + input_free_device(taos_dev);
> + return ret;
> +}
> +
> +/**
> + * Driver exit
> + */
> +static void __exit taos_exit(void)
> +{
> + printk(KERN_INFO "TAOS driver __exit\n");
> +
> + if (taos_wq0) {
> + flush_workqueue(taos_wq0);
> + destroy_workqueue(taos_wq0);
> + }
> +
> + input_free_device(taos_dev);
> +
> + if (client)
> + i2c_unregister_device(client);
> + i2c_del_driver(&taos_driver);
> + device_destroy(taos_class, MKDEV(MAJOR(taos_dev_number), 0));
> + cdev_del(&chip->cdev);
> + kfree(chip);
> + class_destroy(taos_class);
> + unregister_chrdev_region(taos_dev_number, MAX_NUM_DEVICES);
> +
> +}
> +
> +/**
> + * Client probe function - When a valid device is found, the driver's
> device
> + * data structure is updated, and initialization completes
> successfully.
> + */
> +static int taos_probe(struct i2c_client *clientp,
> + const struct i2c_device_id *idp) {
> + int i, ret = 0;
> + unsigned char buf[MAX_DEVICE_REGS];
> + char *device_name;
> +
> + if (device_found)
> + return -ENODEV;
> + if (!i2c_check_functionality(clientp->adapter,
> + I2C_FUNC_SMBUS_BYTE_DATA)) {
> + dev_err(&clientp->dev,
> + "taos_probe() - i2c smbus byte data "
> + "functions unsupported\n");
> + return -EOPNOTSUPP;
> + }
> + if (!i2c_check_functionality(clientp->adapter,
> + I2C_FUNC_SMBUS_WORD_DATA)) {
> + dev_warn(&clientp->dev,
> + "taos_probe() - i2c smbus word data "
> + "functions unsupported\n");
> + }
> + if (!i2c_check_functionality(clientp->adapter,
> + I2C_FUNC_SMBUS_BLOCK_DATA)) {
> + dev_err(&clientp->dev,
> + "taos_probe() - i2c smbus block data "
> + "functions unsupported\n");
> + }
> + chip->client = clientp;
> + i2c_set_clientdata(clientp, chip);
> + for (i = 0; i < MAX_DEVICE_REGS; i++) {
> + ret = i2c_smbus_write_byte(clientp, (CMD_REG | (CNTRL + i)));
> + if (ret < 0) {
> + dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd "
> + "reg failed in taos_probe(), err = %d\n", ret);
> + return ret;
> + }
> + buf[i] = i2c_smbus_read_byte(clientp);
> + }
> + ret = taos_device_name(buf, &device_name);
> + if (ret < 0) {
> + dev_info(&clientp->dev, "i2c device found - does not match "
> + "expected id in taos_probe() 1\n");
> + }
> + if (strcmp(device_name, DEVICE_ID)) {
> + dev_info(&clientp->dev, "i2c device found - does not match "
> + "expected id in taos_probe()2\n");
> + } else {
> + dev_info(&clientp->dev, "i2c device found - matches expected "
> + "id of %s in taos_probe()\n", device_name);
> + device_found = 1;
> + }
> + ret = i2c_smbus_write_byte(clientp, (CMD_REG | CNTRL));
> + if (ret < 0) {
> + dev_err(&clientp->dev, "i2c_smbus_write_byte() to cmd reg "
> + "failed in taos_probe(), err = %d\n", ret);
> + return ret;
> + }
> + strlcpy(clientp->name, DEVICE_ID, I2C_NAME_SIZE);
> + strlcpy(chip->taos_name, DEVICE_ID, ID_NAME_SIZE);
> + chip->valid = 0;
> +
> + taos_settingsP = kmalloc(sizeof(struct taos_settings), GFP_KERNEL);
> + if (!(taos_settingsP)) {
> + dev_err(&clientp->dev,
> + "kmalloc for struct taos_settings failed in taos_probe()\n");
> + return -ENOMEM;
> + }
> +
> + return ret;
> +}
> +
> +/**
> + * Client remove
> + */
> +static int __devexit taos_remove(struct i2c_client *client)
> +{
> + return 0;
> +}
> +
> +/**
> + * Device open function
> + */
> +static int taos_open(struct inode *inode, struct file *file)
> +{
> + int ret = 0;
> + struct tsl258x_chip *chip;
> +
> +
> + /*For debug - Make it ez to c on the console*/
> +#ifdef TAOS_DEBUG
> + printk(KERN_INFO "***************************************************
> \n");
> + printk(KERN_INFO "* *
> \n");
> + printk(KERN_INFO "* TAOS DEVICE *
> \n");
> + printk(KERN_INFO "* DRIVER *
> \n");
> + printk(KERN_INFO "* OPEN *
> \n");
> + printk(KERN_INFO "***************************************************
> \n");
> +#endif
> +
> + chip = container_of(inode->i_cdev, struct tsl258x_chip, cdev);
> + if (strcmp(chip->taos_name, DEVICE_ID) != 0) {
> + dev_err(devp, "device name error in taos_open(), shows %s\n",
> + chip->taos_name);
> + return -ENODEV;
> + }
> +
> + device_released = 0;
> + return ret;
> +}
> +
> +/**
> + * Device release
> + */
> +static int taos_release(struct inode *inode, struct file *file)
> +{
> + int ret = 0;
> + struct tsl258x_chip *chip;
> +
> + device_released = 1;
> + chip = container_of(inode->i_cdev, struct tsl258x_chip, cdev);
> + if (strcmp(chip->taos_name, DEVICE_ID) != 0) {
> + dev_err(devp, "device id incorrect in taos_release(), shows "
> + "%s\n", chip->taos_name);
> + ret = -ENODEV;
> + }
> + taos_fasync(-1, file, 0);
> + free_irq(irqnum, chip);
> + return ret;
> +}
> +
> +/**
> + * Name verification - uses default register values to identify the
> Taos device
> + */
> +static int taos_device_name(unsigned char *bufp, char **device_name)
> +{
> + if (((bufp[0x12] & 0xf0) == 0x00) || (bufp[0x12] == 0x08)) {
> + *device_name = "tritonFN";
> + return 1;
> + } else if (((bufp[0x12] & 0xf0) == 0x90)) {
> + *device_name = "skateFN";
> + return 1;
> + }
> + *device_name = "unknown";
> + printk(KERN_INFO "Identified %s\n", *device_name);
> + return 0;
> +}
> +
> +/**
> + * Device read - reads are permitted only within the range of the
> accessible
> + * registers of the device. The data read is copied safely to user
> space.
> + */
> +static int taos_read(struct file *file, char *buf, size_t count, loff_t
> *ppos)
> +{
> + int ret = 0;
> + struct tsl258x_chip *chip;
> + u8 my_buf[MAX_DEVICE_REGS];
> + u8 reg, i = 0, xfrd = 0;
> +
> +
> + /*Make sure we not in the middle of accessing the device*/
> + if (mutex_trylock(&als_mutex) == 0) {
> + printk(KERN_INFO "Can't get ALS mutex\n");
> + return -1; /*busy, so return LAST VALUE*/
> + }
> +
> + if ((*ppos < 0) || (*ppos >= MAX_DEVICE_REGS) || ((*ppos + count)
> + > MAX_DEVICE_REGS)) {
> + dev_err(devp, "reg limit check failed in taos_read()\n");
> + mutex_unlock(&als_mutex);
> + return -EINVAL;
> + }
> + reg = (u8) *ppos;
> + chip = container_of(file->f_dentry->d_inode->i_cdev,
> + struct tsl258x_chip, cdev);
> + while (xfrd < count) {
> + ret = i2c_smbus_write_byte(chip->client, (CMD_REG | reg));
> + if (ret < 0) {
> + dev_err(devp, "i2c_smbus_write_byte to cmd reg failed "
> + "in taos_read(), err = %d\n", ret);
> + mutex_unlock(&als_mutex);
> + return ret;
> + }
> + my_buf[i++] = i2c_smbus_read_byte(chip->client);
> + reg++;
> + xfrd++;
> + }
> + ret = copy_to_user(buf, my_buf, xfrd);
> + if (ret) {
> + dev_err(devp, "copy_to_user failed in taos_read()\n");
> + mutex_unlock(&als_mutex);
> + return -ENODATA;
> + }
> +
> + mutex_unlock(&als_mutex);
> + return (int) xfrd;
> +}
> +
> +/**
> + * Device write - writes are permitted only within the range of the
> accessible
> + * registers of the device. The data written is copied safely from user
> space.
> + */
> +static int taos_write(struct file *file, const char *buf, size_t count,
> + loff_t *ppos)
> +{
> + int ret = 0;
> + struct tsl258x_chip *chip;
> + u8 my_buf[MAX_DEVICE_REGS];
> + u8 reg, i = 0, xfrd = 0;
> +
> + if (mutex_trylock(&als_mutex) == 0) {
> + printk(KERN_INFO "Can't get ALS mutex\n");
> + return -1; /*busy, so return LAST VALUE*/
> + }
> +
> + if ((*ppos < 0) || (*ppos >= MAX_DEVICE_REGS) || ((*ppos + count)
> + > MAX_DEVICE_REGS)) {
> + dev_err(devp, "reg limit check failed in taos_write()\n");
> + mutex_unlock(&als_mutex);
> + return -EINVAL;
> + }
> + reg = (u8) *ppos;
> + ret = copy_from_user(my_buf, buf, count);
> + if (ret) {
> + dev_err(devp, "copy_from_user failed in taos_write()\n");
> + mutex_unlock(&als_mutex);
> + return -ENODATA;
> + }
> + chip = container_of(file->f_dentry->d_inode->i_cdev,
> + struct tsl258x_chip, cdev);
> + while (xfrd < count) {
> + ret = i2c_smbus_write_byte_data(chip->client, (CMD_REG | reg),
> + my_buf[i++]);
> + if (ret < 0) {
> + dev_err(devp, "i2c_smbus_write_byte_data failed in "
> + "taos_write()\n");
> + mutex_unlock(&als_mutex);
> + return ret;
> + }
> + reg++;
> + xfrd++;
> + }
> +
> + mutex_unlock(&als_mutex);
> + return (int) xfrd;
> +}
> +
> +/**
> + * Device seek - seeks are permitted only within the range of the
> accessible
> + * registers of the device. The new offset is returned.
> + */
> +static loff_t taos_llseek(struct file *file, loff_t offset, int orig)
> +{
> + loff_t new_pos;
> +
> + if ((offset >= MAX_DEVICE_REGS) || (orig < 0) || (orig > 1)) {
> + dev_err(devp, "offset param limit or whence limit check failed "
> + "in taos_llseek()\n");
> + return -EINVAL;
> + }
> + switch (orig) {
> + case 0:
> + new_pos = offset;
> + break;
> + case 1:
> + new_pos = file->f_pos + offset;
> + break;
> + default:
> + return -EINVAL;
> + break;
> + }
> + if ((new_pos < 0) || (new_pos >= MAX_DEVICE_REGS)) {
> + dev_err(devp, "new offset check failed in taos_llseek()\n");
> + return -EINVAL;
> + }
> + file->f_pos = new_pos;
> + return new_pos;
> +}
> +
> +/**
> + * Fasync function - called when the FASYNC flag in the file descriptor
> of the
> + * device indicates that a new user program wants to be added to the
> wait queue
> + * of the device - calls fasync_helper() to add the new entry to the
> queue.
> + */
> +static int taos_fasync(int fd, struct file *file, int mode)
> +{
> + chip = container_of(file->f_dentry->d_inode->i_cdev, struct
> + tsl258x_chip, cdev);
> + return fasync_helper(fd, file, mode, &chip->async_queue);
> +}
> +
> +/**
> + * Provides initial operational parameter defaults.\n
> + * These defaults may be changed by the following:\n
> + * - system deamon
> + * - user application (via ioctl)
> + * - directly writing to the taos procfs file
> + * - external kernel level modules / applications
> + */
> +static void taos_defaults()
> +{
> + /*Operational parameters*/
> + taos_cycle_type = LIGHT;
> + /*default is ALS only*/
> + taos_settings.als_time = 100;
> + /*must be a multiple of 50mS*/
> + taos_settings.als_gain = 0;
> + /*this is actually an index into the gain table*/
> + /*assume clear glass as default*/
> + taos_settings.als_gain_trim = 1000;
> + /*default gain trim to account for aperture effects*/
> + taos_settings.als_persistence = 0;
> + /*default number of 'out of bounds' b4 interrupt*/
> + taos_settings.als_cal_target = 130;
> + /*Known external ALS reading used for calibration*/
> + taos_settings.interrupts_enabled = 0;
> + /*Interrupts enabled (ALS) 0 = none*/
> +
> + /*Initialize ALS data to defaults*/
> + als_cur_info.als_ch0 = 0;
> + als_cur_info.als_ch1 = 0;
> + als_cur_info.lux = 0;
> +
> + taos_settings.als_thresh_high = ALS_THRESHOLD_HI_LIMIT;
> + taos_settings.als_thresh_low = ALS_THRESHOLD_LO_LIMIT;
> +
> +
> +#ifdef TAOS_DEBUG
> +printk(KERN_INFO "\nDEFAULTS LOADED\n");
> +#endif
> +}
> +EXPORT_SYMBOL(taos_defaults);
> +/*........................................................................*/
> +/*@} End of Initial*/
> +
> +
> +/*===========================================================================*/
> +/**@...group IOCTL User ioctl Functions
> + * The section applies to 'ioctl' calls used primarily to support
> user-land applications.\n
> + * @{
> + */
> +/**
> + * Ioctl functions - each one is documented below.
> + */
> +static int taos_ioctl(struct inode *inode, struct file *file, unsigned
> int cmd,
> + unsigned long arg) {
> + int ret = 0;
> + struct tsl258x_chip *chip;
> + int tmp;
> + /*u8 reg_val;*/
> +
> + chip = container_of(inode->i_cdev, struct tsl258x_chip, cdev);
> + switch (cmd) {
> + /**
> + * - ALS_ON - called to set the device in ambient light sense mode.
> + * configured values of light integration time, initial interrupt
> + * filter, gain, and interrupt thresholds (if interrupt driven) are
> + * initialized. Then power, adc, (and interrupt if needed) are
> enabled.
> + */
> + case TAOS_IOCTL_ALS_ON:
> + taos_cycle_type = LIGHT;
> + printk(KERN_INFO "ALS On\n");
> + return taos_chip_on();
> + break;
> + /**
> + * - ALS_OFF - called to stop ambient light sense mode of operation.
> + * Clears the filter history, and clears the control register.
> + */
> + case TAOS_IOCTL_ALS_OFF:
> + taos_chip_off();
> + break;
> + /**
> + * - ALS_DATA - request for current ambient light data. If correctly
> + * enabled and valid data is available at the device, the function
> + * for lux conversion is called, and the result returned if valid.
> + */
> + case TAOS_IOCTL_ALS_DATA:
> + /*Are we actively updating the struct?*/
> + if ((taos_settings.interrupts_enabled
> + & CNTL_ALS_INT_ENBL) == 0x00)
> + return taos_get_lux(); /*No - so get fresh data*/
> + else
> + return als_cur_info.lux;
> + /*Yes - data is fresh as last change*/
> + break;
> +
> + /**
> + * - ALS_CALIBRATE - called to run one calibration cycle, during
> assembly.
> + * The lux value under a known intensity light source is used to obtain
> + * a "gain trim" multiplier which is to be used to normalize subsequent
> + * lux data read from the device, after the calibration is completed.
> + * This 'known intensity should be the value of als_cal_target.
> + * If not - make is so!
> + */
> + case TAOS_IOCTL_ALS_CALIBRATE:
> + return taos_als_calibrate(taos_settings.als_cal_target);
> + break;
> + /**
> + * - CONFIG-GET - returns the current device configuration values to
> the
> + * caller. The user mode application can display or store configuration
> + * values, for future reconfiguration of the device, as needed.
> + * Refer to structure "taos_settings" in '.h' file.
> + */
> + case TAOS_IOCTL_CONFIG_GET:
> + ret = copy_to_user((struct taos_settings *) arg, &taos_settings,
> + sizeof(struct taos_settings));
> + if (ret) {
> + dev_err(devp,
> + "copy_to_user() failed in ioctl config_get\n");
> + return -ENODATA;
> + }
> + return ret;
> + break;
> + /**
> + * - GET_ALS - returns the current ALS structure values to the
> + * caller. The values returned represent the last call to
> + * taos_get_lux(). This ioctl can be used when the driver
> + * is operating in the interrupt mode.
> + * Refer to structure "als_cur_info" in '.h' file.
> + */
> + case TAOS_IOCTL_GET_ALS:
> + ret = copy_to_user((struct taos_als_info *) arg,
> + &als_cur_info,
> + sizeof(struct taos_als_info));
> + if (ret) {
> + dev_err(devp,
> + "copy_to_user() failed in ioctl to get "
> + "taos_als_info\n");
> + return -ENODATA;
> + }
> + return ret;
> + break;
> + /**
> + * - CONFIG-SET - used by a user mode application to set the desired
> + * values in the driver's in memory copy of the device configuration
> + * data. Light integration times are aligned optimally, and driver
> + * global variables dependent on configured values are updated here.
> + * Refer to structure "taos_settings" in '.h' file.
> + */
> + case TAOS_IOCTL_CONFIG_SET:
> + ret = copy_from_user(&taos_settings,
> + (struct taos_settings *) arg,
> + sizeof(struct taos_settings));
> + if (ret) {
> + dev_err(devp,
> + "copy_from_user() failed in ioctl config_set\n");
> + return -ENODATA;
> + }
> + return ret;
> + break;
> + /**
> + * - LUX_TABLE-GET - returns the current LUX coefficients table to the
> + * caller. The user mode application can display or store the table
> + * values, for future re-calibration of the device, as needed.
> + * Refer to structure "taos_lux" in '.h' file.
> + */
> + case TAOS_IOCTL_LUX_TABLE_GET:
> + ret = copy_to_user((struct taos_lux *) arg,
> + &taos_device_lux,
> + sizeof(taos_device_lux));
> + if (ret) {
> + dev_err(devp,
> + "copy_to_user() failed in ioctl "
> + "TAOS_IOCTL_LUX_TABLE_GET\n");
> + return -ENODATA;
> + }
> + return ret;
> + break;
> + /**
> + * - LUX TABLE-SET - used by a user mode application to set the desired
> + * LUX table values in the driver's in memory copy of the lux table
> + * Refer to structure "taos_lux" in '.h' file.
> + */
> + case TAOS_IOCTL_LUX_TABLE_SET:
> + ret = copy_from_user(&taos_lux,
> + (struct taos_lux *) arg,
> + sizeof(taos_device_lux));
> + if (ret) {
> + dev_err(devp, "copy_from_user() failed in ioctl "
> + "TAOS_IOCTL_LUX_TABLE_SET\n");
> + return -ENODATA;
> + }
> +#ifdef ASYNC_NOTIFY
> + /*Notify the user-land app (if any)*/
> + if (chip->async_queue)
> + kill_fasync(&chip->async_queue, SIGIO, POLL_IN);
> +#endif
> +
> +
> + return ret;
> + break;
> + /**
> + * - TAOS_IOCTL_ID - used to query driver name & version
> + */
> + case TAOS_IOCTL_ID:
> + ret = copy_to_user((char *) arg,
> + &driver_version_id,
> + sizeof(driver_version_id));
> + dev_info(devp, "%s\n", DRIVER_VERSION_ID);
> + return ret;
> + break;
> + /*
> + * - TAOS_IOCTL_SET_GAIN - used to set/change the device analog gain.
> + * The value passed into here from the user is the index into the
> table.
> + * Index = (0 - 3) Used to validate the gain selection index
> + */
> + case TAOS_IOCTL_SET_GAIN:
> + get_user(tmp, (int *)arg);
> + if (tmp > MAX_GAIN_STAGES)
> + return -1;
> + taos_settings.als_gain = tmp;
> + ret = taos_i2c_write(CMD_REG|GAIN, (u8 *)&tmp);
> + if (ret < 0) {
> + dev_err(devp, "taos_i2c_write to turn on device "
> + "failed in taos_chip_on.\n");
> + return -1;
> + }
> + return ret;
> + break;
> +
> + default:
> + return -EINVAL;
> + break;
> + }
> +
> + return ret;
> +
> + }
> +/*........................................................................*/
> +/*@} end of IOCTL section*/
> +
> +
> +/*===========================================================================*/
> +/**@...group ALS Ambient Light Sense (ALS)
> + * The section applies to the ALS related functions.\n
> + * Other ALS releated functions may appear elsewhere in the code.\n
> + * @{
> + */
> +
> +/*........................................................................*/
> +
> +/**
> + * Reads and calculates current lux value.
> + * The raw ch0 and ch1 values of the ambient light sensed in the last
> + * integration cycle are read from the device.
> + * Time scale factor array values are adjusted based on the integration
> time.
> + * The raw values are multiplied by a scale factor, and device gain is
> obtained
> + * using gain index. Limit checks are done next, then the ratio of a
> multiple
> + * of ch1 value, to the ch0 value, is calculated. The array
> taos_device_luxP[]
> + * declared above is then scanned to find the first ratio value that is
> just
> + * above the ratio we just calculated. The ch0 and ch1 multiplier
> constants in
> + * the array are then used along with the time scale factor array
> values, to
> + * calculate the lux.
> + *
> + * \param none
> + * \return int -1 = Failure, Lux Value = success
> + */
> +static int taos_get_lux(void)
> +{
> + u32 ch0, ch1; /* separated ch0/ch1 data from device */
> + u32 lux; /* raw lux calculated from device data */
> + u32 ratio;
> + u8 buf[5];
> + struct taos_lux *p;
> +
> + int i, ret;
> +
> + u32 ch0lux = 0x0000;
> + u32 ch1lux = 0x0000;
> +
> + if (mutex_trylock(&als_mutex) == 0) {
> + printk(KERN_INFO "Can't get ALS mutex\n");
> + return als_cur_info.lux; /*busy, so return LAST VALUE*/
> + }
> +
> + if (taos_chip_status != TAOS_CHIP_WORKING) {
> + /*device is not enabled*/
> + printk(KERN_INFO "device is not enabled\n");
> + mutex_unlock(&als_mutex);
> + return -1;
> + }
> +
> + if ((taos_cycle_type & LIGHT) == 0) {
> + /*device not in ALS mode*/
> + printk(KERN_INFO "device not in ALS mode\n");
> + mutex_unlock(&als_mutex);
> + return -1;
> + }
> +
> + ret = taos_i2c_read((CMD_REG), &buf[0], 1);
> + if (ret < 0) {
> + printk(KERN_INFO "taos_i2c_read() to CMD_REG reg failed in "
> + "taos_get_lux()\n");
> + mutex_unlock(&als_mutex);
> + return -1;
> + }
> + /* is data new & valid */
> + if (!(buf[0] & STA_ADCINTR)) {
> + printk(KERN_INFO "Data not valid, so return LAST VALUE\n");
> + mutex_unlock(&als_mutex);
> + return als_cur_info.lux; /*have no data, so return LAST VALUE*/
> + }
> +
> + for (i = 0; i < 4; i++) {
> + ret = taos_i2c_read((CMD_REG | (ALS_CHAN0LO + i)), &buf[i], 1);
> + if (ret < 0) {
> + dev_err(devp,
> + "taos_i2c_read() to (ALS_CHAN0LO + i) failed in "
> + "taos_get_lux()\n");
> + mutex_unlock(&als_mutex);
> + return -1;
> + }
> + }
> +
> + /* clear status, really interrupt status (interrupts are off), but
> + * we use the bit anyway */
> + ret = taos_i2c_write_command(CMD_REG | CMD_SPL_FN | CMD_ALS_INTCLR);
> + if (ret < 0) {
> + dev_err(devp,
> + "taos_i2c_write_command failed in "
> + "taos_chip_on, err = %d\n", ret);
> + mutex_unlock(&als_mutex);
> + return -1; /*have no data, so return fail*/
> + }
> +
> + /* extract ALS/lux data */
> + ch0 = (buf[1] << 8) | buf[0];
> + ch1 = (buf[3] << 8) | buf[2];
> +
> + als_cur_info.als_ch0 = ch0;
> + als_cur_info.als_ch1 = ch1;
> +
> +
> +#ifdef TAOS_DEBUG
> + printk(KERN_INFO " ch0=%d/0x%x ch1=%d/0x%x\n", ch0, ch0, ch1, ch1);
> +#endif
> +
> + if ((ch0 >= als_saturation) || (ch1 >= als_saturation)) {
> +return_max:
> + als_cur_info.lux = MAX_LUX;
> + mutex_unlock(&als_mutex);
> + return als_cur_info.lux;
> + }
> +
> + if (ch0 == 0) {
> + als_cur_info.lux = 0;
> +#ifdef TAOS_DEBUG
> + printk(KERN_INFO "ch0==0\n");
> +#endif
> + mutex_unlock(&als_mutex);
> +
> + return als_cur_info.lux;
> + /*have no data, so return LAST VALUE*/
> + }
> + /* calculate ratio */
> + ratio = (ch1 << 15) / ch0;
> + /* convert to unscaled lux using the pointer to the table */
> + for (p = (struct taos_lux *) taos_device_lux;
> + p->ratio != 0 && p->ratio < ratio; p++)
> + ;
> +
> + if (p->ratio == 0) {
> +#ifdef TAOS_DEBUG
> + dev_info(devp, "ratio = %04x p->ratio = %04x\n",
> + ratio, p->ratio);
> +#endif
> + lux = 0;
> + } else {
> + ch0lux = ((ch0 * p->ch0) +
> + (gainadj[taos_settings.als_gain].ch0 >> 1))
> + / gainadj[taos_settings.als_gain].ch0;
> + ch1lux = ((ch1 * p->ch1) +
> + (gainadj[taos_settings.als_gain].ch1 >> 1))
> + / gainadj[taos_settings.als_gain].ch1;
> + lux = ch0lux - ch1lux;
> + }
> +
> + /* note: lux is 31 bit max at this point */
> + if (ch1lux > ch0lux) {
> + printk(KERN_INFO "No Data - Return last value\n");
> + als_cur_info.lux = 0;
> + mutex_unlock(&als_mutex);
> + return als_cur_info.lux; /*have no data, so return LAST VALUE*/
> + }
> + /* adjust for active time scale */
> + lux = (lux + (als_time_scale >> 1)) / als_time_scale;
> + /* adjust for active gain scale */
> + lux >>= 13; /* tables have factor of 8192 builtin for accuracy */
> +
> + lux = (lux * taos_settings.als_gain_trim + 500) / 1000;
> +
> +
> +#ifdef TAOS_DEBUG
> + printk(KERN_INFO "lux=%d\n", lux);
> +#endif
> + if (lux > MAX_LUX) /* check for overflow */
> + goto return_max;
> +
> + als_cur_info.lux = lux;
> + /*Update the structure with the latest VALID lux.*/
> +
> + mutex_unlock(&als_mutex);
> + return lux;
> +}
> +EXPORT_SYMBOL(taos_get_lux);
> +
> +/**
> + * Obtain single reading and calculate the als_gain_trim (later used to
> derive actual lux)
> + *\param ulong als_cal_target ALS target (real world)
> + *\return int updated gain_trim value
> + */
> +int taos_als_calibrate(unsigned long als_cal_target)
> +{
> + u8 reg_val;
> + unsigned int gain_trim_val;
> + int ret;
> + int lux_val;
> +
> +
> + /*This may seem redundant but..
> + We need this next line in case we call this function from an
> + external application who has a different target value than
> + our defaults.
> + In which case, make 'that' our new default/settings.*/
> + taos_settings.als_cal_target = als_cal_target;
> +
> + ret = i2c_smbus_write_byte(chip->client, (CMD_REG | CNTRL));
> + if (ret < 0) {
> + dev_err(devp,
> + "i2c_smbus_write_byte to cmd reg failed in "
> + "ioctl als_calibrate\n");
> + return ret;
> + }
> + reg_val = i2c_smbus_read_byte(chip->client);
> +
> + if ((reg_val & (CNTL_ADC_ENBL | CNTL_PWRON))
> + != (CNTL_ADC_ENBL | CNTL_PWRON)) {
> + dev_err(devp,
> + "reg_val & (CNTL_ADC_ENBL | CNTL_PWRON)) "
> + "!= (CNTL_ADC_ENBL | CNTL_PWRON) in ioctl als_calibrate\n");
> + return -ENODATA;
> + }
> +
> + ret = i2c_smbus_write_byte(chip->client, (CMD_REG | STATUS));
> + if (ret < 0) {
> + dev_err(devp,
> + "i2c_smbus_write_byte to cmd reg failed in "
> + "ioctl als_calibrate\n");
> + return ret;
> + }
> + reg_val = i2c_smbus_read_byte(chip->client);
> +
> + if ((reg_val & STA_ADCVALID) != STA_ADCVALID) {
> + dev_err(devp,
> + "(reg_val & STA_ADCVALID) != STA_ADCVALID in "
> + "ioctl als_calibrate\n");
> + return -ENODATA;
> + }
> + lux_val = taos_get_lux();
> + if (lux_val < 0) {
> + dev_err(devp,
> + "taos_get_lux() returned bad value %d in "
> + "ioctl als_calibrate\n",
> + lux_val);
> + return lux_val;
> + }
> + gain_trim_val = (unsigned int) (((taos_settings.als_cal_target)
> + * taos_settings.als_gain_trim) / lux_val);
> +
> + dev_info(devp, "\n\ntaos_settings.als_cal_target = %d\n"
> + "taos_settings.als_gain_trim = %d\nlux_val = %d\n",
> + taos_settings.als_cal_target,
> + taos_settings.als_gain_trim,
> + lux_val);
> +
> + if ((gain_trim_val < 250) || (gain_trim_val > 4000)) {
> + dev_err(devp,
> + "ALS calibrate result %d out of range "
> + "in ioctl als_calibrate\n",
> + gain_trim_val);
> + return -ENODATA;
> + }
> + taos_settings.als_gain_trim = (int) gain_trim_val;
> +
> + return (int) gain_trim_val;
> +}
> +EXPORT_SYMBOL(taos_als_calibrate);
> +
> +/*........................................................................*/
> +/*@} End of ALS section*/
> +
> +/*===========================================================================*/
> +/**@...group DEV_CTRL Device Control Functions
> + * @{
> + */
> +
> +/*........................................................................*/
> +/**
> + * Turn the device on.
> + * Configuration and taos_cycle_type must be set before calling this
> function.
> + * \param none.
> + * \return int 0 = success, < 0 = failure
> + */
> +static int taos_chip_on()
> +{
> + int i;
> + int ret = 0;
> + u8 *uP;
> + u8 utmp;
> + int als_count;
> + int als_time;
> +
> +
> + /*make sure taos_cycle_type is set.*/
> + if ((taos_cycle_type != LIGHT))
> + return -1;
> +
> + /*and make sure we're not already on*/
> + if (taos_chip_status == TAOS_CHIP_WORKING) {
> + /*if forcing a register update - turn off, then on*/
> + printk(KERN_INFO "device is already enabled\n");
> + return -1;
> + }
> +
> + /* . . . . . . . . SHADOW REGISTER
> INITIALIZATION . . . . . . . . . . .
> + Note:
> + If interrupts are enabled, keeping persist at 0 should prime the
> pump.
> + So don't set persist in shadow register. Just enable if required.*/
> + taos_config[INTERRUPT] = (taos_settings.interrupts_enabled & 0xF0);
> +
> +
> + /*determine als integration regster*/
> + als_count = (taos_settings.als_time * 100 + 135) / 270;
> + if (als_count == 0)
> + als_count = 1; /*ensure at least one cycle*/
> +
> +
> + /*convert back to time (encompasses overrides)*/
> + if (taos_cycle_type & LIGHT) {
> + als_time = (als_count * 27 + 5) / 10;
> + taos_config[ALS_TIME] = 256 - als_count;
> + } else
> + taos_config[ALS_TIME] = 0xff;
> +
> +
> + /*Set the gain based on taos_settings struct*/
> + taos_config[GAIN] = taos_settings.als_gain;
> +
> +
> + /*set globals re scaling and saturation*/
> + als_saturation = als_count * 922; /*90% of full scale*/
> + als_time_scale = (als_time + 25) / 50;
> +
> +
> + /* . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
> + SKATE Specific power-on / adc enable sequence
> + Power on the device 1st.*/
> + utmp = CNTL_PWRON;
> + ret = taos_i2c_write(CMD_REG | CNTRL, &utmp);
> + if (ret < 0) {
> + dev_err(devp,
> + "taos_i2c_write to turn on device failed in "
> + "taos_chip_on.\n");
> + return -1;
> + }
> +
> + /*User the following shadow copy for our delay before enabling ADC
> + Write ALL THE REGISTERS*/
> + for (i = 0, uP = taos_config; i < TAOS_REG_MAX; i++) {
> + ret = taos_i2c_write(CMD_REG + i, uP++);
> + if (ret < 0) {
> + dev_err(devp,
> + "taos_i2c_write to reg %d failed in "
> + "taos_chip_on.\n", i);
> + return -1;
> + }
> + }
> +
> + mdelay(3);
> + /*NOW enable the ADC
> + initialize the desired mode of operation*/
> + utmp = CNTL_PWRON | CNTL_ADC_ENBL;
> + ret = taos_i2c_write(CMD_REG | CNTRL, &utmp);
> + if (ret < 0) {
> + dev_err(devp,
> + "taos_i2c_write to turn on device failed in "
> + "taos_chip_on.\n");
> + return -1;
> + }
> + taos_chip_status = TAOS_CHIP_WORKING;
> +
> +#ifdef TAOS_DEBUG
> + dev_info(devp, "chip_on() called\n\n");
> +#endif
> +
> + return ret; /*returns result of last i2cwrite*/
> +}
> +EXPORT_SYMBOL(taos_chip_on);
> +
> +/*........................................................................*/
> +/**
> + * Turn the device OFF.
> + * \param none.
> + * \return int 0 = success, < 0 = failure
> + */
> +static int taos_chip_off()
> +{
> + int ret;
> + u8 utmp;
> +
> +
> + /*turn device off*/
> + taos_chip_status = TAOS_CHIP_SLEEP;
> + utmp = 0x00;
> + ret = taos_i2c_write(CMD_REG | CNTRL, &utmp);
> + als_on = FALSE;
> + /*init_done = 0x00; *//*used by ALS irq as one/first shot*/
> +#ifdef TAOS_DEBUG
> + printk(KERN_INFO "chip_off() called\n");
> +#endif
> +
> + return ret;
> +
> +}
> +EXPORT_SYMBOL(taos_chip_off);
> +/*........................................................................*/
> +/*@} End of Device Control Section*/
> +
> +/*===========================================================================*/
> +
> +/*===========================================================================*/
> +/**@...group I2C-HAL I2C/SMBus Communication Functions
> + * The sections pertains to the driver/device communication functions\n
> + * facilitated via SMBus in an I2C manner.\n
> + * These functions represent several layers of abstraction.
> + * Also note, some i2c controllers do not support block read/write.
> + * @{
> + */
> +
> +/**
> + * Read a number of bytes starting at register (reg) location.
> + *
> + * \param unsigned char reg - device register
> + * \param unsigned char *val - location to store results
> + * \param unsigned int number of bytes to read
> + * \return TAOS_SUCCESS, or i2c_smbus_write_byte ERROR code
> + *
> + */
> +static int taos_i2c_read(u8 reg, u8 *val, unsigned int len)
> +{
> + int result;
> + int i;
> +
> + if (len > MAXI2C)
> + len = MAXI2C;
> + for (i = 0; i < len; i++) {
> + /* select register to write */
> + if (reg >= 0) {
> + result = i2c_smbus_write_byte(chip->client,
> + (CMD_REG | (reg + i)));
> +
> + if (result < 0) {
> + dev_err(devp,
> + "FAILED: i2c_smbus_write_byte_data in "
> + "taos_io_read()\n");
> + return result;
> + }
> + /* read the data */
> + *val = i2c_smbus_read_byte(chip->client);
> +#ifdef TAOS_DEBUG_SMBUS
> + dev_info(devp,
> + "READ FROM REGISTER [%02X] -->%02x<--\n",
> + (CMD_REG | (reg + i)) , *data);
> +#endif
> + val++;
> + }
> + }
> + return TAOS_SUCCESS;
> +}
> +
> +/**
> + * This function is used to send a an register address followed by a
> data value
> + * When calling this function remember to set the register MSBit
> + * (if applicable).
> + * \param unsigned char register
> + * \param unsigned char * pointer to data value(s) to be written
> + * \return TAOS_SUCCESS, or i2c_smbus_write_byte error code.
> + */
> +static int taos_i2c_write(u8 reg, u8 *val)
> +{
> + int retval;
> + retval = i2c_smbus_write_byte_data(chip->client, reg, (*val));
> + if (retval < 0) {
> + dev_err(devp, "FAILED: i2c_smbus_write_byte_data\n");
> + return retval;
> + }
> +
> + return TAOS_SUCCESS;
> +}
> +
> +/**
> + * This function is used to send a command to device command/control
> register
> + * All bytes sent using this command have their MSBit set - it's a
> command!
> + * \param unsigned char register to write
> + * \return TAOS_SUCCESS, or i2c_smbus_write_byte error code.
> + */
> +static int taos_i2c_write_command(u8 reg)
> +{
> + int result;
> + u8 *p;
> + u8 buf;
> +
> + p = &buf;
> + *p = reg |= CMD_REG;
> + /*write the data*/
> + result = i2c_smbus_write_byte(chip->client, (*p));
> + if (result < 0) {
> + dev_err(devp, "FAILED: i2c_smbus_write_byte\n");
> + return result;
> + }
> + return TAOS_SUCCESS;
> +}
> +
> +/*........................................................................*/
> +/*@} //end of I2C-HAL section*/
> +
> +
> +/**@...group group6 Sysfs Interface Functions
> + * The following functions are for access via the sysfs style
> interface.\n
> + * Use 'cat' to read, 'echo >' to write\n
> + * @{
> + */
> +
> +/*........................................................................*/
> +/*sysfs interface functions begin here*/
> +
> +static ssize_t taos_device_id(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%s %s\n", DEVICE_ID, DRIVER_VERSION_ID);
> +}
> +
> +static ssize_t taos_power_state_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_chip_status);
> + return 0;
> +}
> +
> +static ssize_t taos_power_state_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> +
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value == 1)
> + taos_chip_on();
> + else
> + taos_chip_off();
> +
> + return len;
> +}
> +
> +static ssize_t taos_gain_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_gain);
> + return 0;
> +}
> +
> +static ssize_t taos_gain_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> + if (value) {
> + if (value > 4) {
> + printk(KERN_INFO "Invalid Gain Index\n");
> + return -1;
> + } else {
> + taos_settings.als_gain = value;
> + }
> + }
> + return len;
> +}
> +
> +static ssize_t taos_interrupt_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.interrupts_enabled);
> + return 0;
> +}
> +
> +static ssize_t taos_interrupt_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value) {
> + if (value > 1) {
> + printk(KERN_INFO "Invalid: 0 or 1\n");
> + return -1;
> + } else {
> + taos_settings.interrupts_enabled = CNTL_ALS_INT_ENBL;
> + }
> + }
> + return len;
> +}
> +
> +static ssize_t taos_als_time_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_time);
> + return 0;
> +}
> +
> +static ssize_t taos_als_time_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_time = value;
> +
> + return len;
> +}
> +
> +static ssize_t taos_als_trim_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_gain_trim);
> + return 0;
> +}
> +
> +static ssize_t taos_als_trim_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_gain_trim = value;
> +
> + return len;
> +}
> +
> +static ssize_t taos_als_persistence_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_persistence);
> + return 0;
> +}
> +
> +static ssize_t taos_als_persistence_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_persistence = value;
> +
> + return len;
> +}
> +
> +static ssize_t taos_als_cal_target_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_cal_target);
> + return 0;
> +}
> +
> +static ssize_t taos_als_cal_target_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_cal_target = value;
> +
> + return len;
> +}
> +
> +static ssize_t taos_lux_show(struct device *dev, struct
> device_attribute *attr,
> + char *buf)
> +{
> + int lux = 0;
> + if ((taos_settings.interrupts_enabled & CNTL_ALS_INT_ENBL) == 0x00)
> + lux = taos_get_lux(); /*get fresh data*/
> + else
> + lux = als_cur_info.lux; /*data is fresh as last change*/
> +
> + return sprintf(buf, "%d\n", lux);
> + return 0;
> +}
> +
> +static ssize_t taos_do_calibrate(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value == 1)
> + taos_als_calibrate(taos_settings.als_cal_target);
> +
> + return len;
> +}
> +
> +static ssize_t taos_als_thresh_low_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_thresh_low);
> + return 0;
> +}
> +
> +static ssize_t taos_als_thresh_low_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_thresh_low = value;
> +
> + return len;
> +}
> +
> +static ssize_t taos_als_thresh_high_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + return sprintf(buf, "%d\n", taos_settings.als_thresh_high);
> + return 0;
> +}
> +
> +static ssize_t taos_als_thresh_high_store(struct device *dev,
> + struct device_attribute *attr, const char *buf, size_t len)
> +{
> + unsigned long value;
> + if (strict_strtoul(buf, 0, &value))
> + return -EINVAL;
> +
> + if (value)
> + taos_settings.als_thresh_high = value;
> +
> + return len;
> +}
> +
> +/*@} End of Sysfs Interface Functions - gp6*/
> +/*===========================================================================*/
> +
> +static void taos_als_auto_update(struct work_struct *update)
> +{
> + if (taos_chip_status != TAOS_CHIP_WORKING) {
> + taos_chip_on();
> + mdelay(100);
> + }
> + taos_get_lux();
> + input_report_abs(taos_dev, ABS_X, als_cur_info.lux);
> + input_sync(taos_dev);
> +
> + queue_delayed_work(taos_wq0, luxUd, LUX_UPDATE_PERIOD);
> +
> +}
> +
> +
> +
> +MODULE_AUTHOR("J. August Brenner<jbrenner@...sinc.com>");
> +MODULE_DESCRIPTION("TAOS 258x ambient light sensor driver");
> +MODULE_LICENSE("GPL");
> +
> +module_init(taos_init);
> +module_exit(taos_exit);
> +
--
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